Twin fountain pens



June 27, 1950 w. K. *REDDr-:MANN r 2,513,201

TWIN FOUNTAIN PENS` Filed Oct. 26, 1948 Patented June 27, 1950 OFFICE TWIN FOUNTAIN PENS Werner Karl Reddemann, Detmold, Germany Application Voctober 2s, 194.8,"se`ria1-No. 56,530 In' France November 4, 1947y A 'I'his invention relates to new and useful improvements in twin or double fountain pens. vDouble fountain pens with two points and two filling chambers and ink barrels are known in connection with which each ink barrel is provided with a. piston and shaft. These Aprior devices, however, practically speaking, consist of two individual fillers which are connected ton `:gather at their ends by a coupling member. For lling they must, therefore, be uncoupled and separated inasmuch as the longitudinal piston of each one must be individually actuated by its own turning head.

On the other hand, double fillers have been manufactured which do not have any pistons, and therefore must be supplied with filler tubes. Finally, a double filler has been suggested, the two filling parts of which are connected to each other by a middle piece consisting of a common, turnable section, in which two spindles are displaceable with the suction pistons. In this construction the ink tubes and the center piece separate during lling of the fountain pen with ink. This separation of the parts causes looseness and leakage of ink, with resultant drying of ink in the moving parts, impeding operation. The present invention is intended to correct this defective construction.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawing, and to the appended claim in which the various novel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure- Fig. l is a central sectional view of a twin fountain pen constructed in accordance with this invention.

Fig. 2 is a fragmentary enlarged detailed View of the central portion of Fig. 1, but illustrated with the spindles of the pistons separated.

Fig. 3 is a sectional view taken on the line 3--3 of Fig. 2.

The twin fountain pen, in accordance with this invention, includes a middle stationary hollow cylinder I having end portions II. This hollow cylinder I0 is formed from three sections, namely, a central annular section I2, and end sections I3 threadedly mounted in and extending from the ends of said central annular section I2. An annular turnable member I is provided for each end portion I3, and is turnably mounted on said end portion coaxially of said cylinder IIl. These turnable members I5 have reduced end portions I6 formed with external threads. The end sections I3 are provided with flanges Il having bottom shoulders against which the ends of the turnable members I5 engage. The bottom shoulders of the flanges I 'I are opposed by reduced end por- V1 Claim. (o1. 12o-4211) tions ofr the central annular section I2 ofthe cylinder I Il thus forming grooves into which portions'of theV turnablemembers I5 engage and by which the turnable members I5 are turnably supported.

An ink tube I3 is provided for jeach end portion I6 and is coaxially mounted thereon. The ink tubes I8 `have-internal threads threadedly engaging the external threads of said reduced end portions I6. `The outer end of each ink tube I8 is provided with an end member I9 having an ink feed 20 and a pen point 2| mounted thereon. 'I'he end members I9 have reduced inner ends 22 which are threadedly engaged into the ends of the ink tubes I8.

A suction piston 23 is engaged in one of said ink tubes I8, and a suction piston 24 is engaged in the other of the ink tubes I8. These suction pistons 23 and 24 have tight fits in the ink tubes I8 in order to turn with the ink tubes when the latter are turned. A spindle 25 is rigidly connected with the piston 23. Aspindle 26 is rigidly connected with the piston 24. These spindles 25 and 26 extend coaxially through the ink tubes I8 and threadedly engage through the ends of the hollow -cylinder I 0 in order to be displaced inwardly and outwardly as the ink tubes I8 are turned in one direction and the other. The spindle 26 is hollow and has an open end, and the spindle 25 is solid and telescopically engages into the open end of the spindle 26.

A cap 30 is removably engaged over the bottom pen point 2| and the bottom ink tube I8. This cap 36 has a central internal threaded portion 3l which threadedly engages external threads upon the bottom ink tube I 8. The edge 32 of the cap 3D abuts the bottom turnable member I5. A top cap 34 engages over the top pen point 2I and the top ink tube I8. This cap 34 is made from two sections, namely, a tubular section 35 and an end section 36. The end section 36 threadedly engages into the end of the tubular section 35. There is a small space 31 between these sections for an ordinary fountain pen clip. The tubular section 35 is provided with an internal threaded portion 38 which threadedly engages external threads formed on the top ink tube I8. The inner end of the tubular section 35 abuts the top turnable member I5.

The operation of the new twin fountain pen may be understood from the following:

The caps 30 and 34 may be removed at will to expose the twin `pen points 2|. The hollow cylinder I0 is held stationary, while the turnable members I5 may be turned in one direction or the other in order to correspondingly turn the ink tubes I8. Since the suction pistons 23 and 24 are tight ts in the ink tubes I8, they will be turned with the ink tubes. Because the pistons 23 and 24 are turned, and spindles 25 and 26 will be correspondingly turned, and because said spindles are threadedly engaged in the ends of the stationary hollow cylinder l0, the spindles will be longitudinally displaced and will correspondingly displace the pistons 23 and 24. In this way ink may be drawn into or expelled from the ink tubes I8.

While I have illustrated and described the -preferred embodiment of my invention, it is to be understood that I do not limit 'myself to -rthe precise construction herein disclosed Iand the ,right is reserved to all changes and modifications coming within the scope of the invention ask dened g in the appended claim.

VHaving thus described my invention, what I 'claim as new andldesire tosecureby United States LettersPatent is:

In a twin fountain pen, a middle stationary hollow cylinder having end portions, a turnable member turnably mounted on each end portion of said cylinder coaxially of said cylinder and having reduced portions coaxial of said cylinder, an ink tube coaxially mounted on each of said reduced portions, a suction piston for each Vof said ink tubes making a tight fit in each of said 4 ink tubes in order to turn when said ink tubes are turned, a spindle for each of said pistons xedly connected with each of said pistons, extending coaxially through said ink tubes, and threadedly engaging through the ends of said cylinder in order to be displaced as said ink tubes :are turned, said cylinder having coaxial external `peripheral grooves on its end portions and said turnable members being turnably mounted in said `grooves in order that said ink tubes merely turn in vrelation to saidmiddle stationary hollow cylinder without moving longitudinally of said middle stationary hollow cylinder when said pistons arezdisplaced.

WERNER KARL REDDEMANN.

REFERENCES CITED v The following references are of record :in the le of 4this patent:

UNITED .STATES PATENTS Number Name Date 1,827,579 Harris Oct. 13, 193l1 2,148,566 Leon Feb. 28, 1939 2,457,217 Ernst Dec. .28, 1948 

